echinocystis genus --- gourd family

wild cucumber (Echinocystis lobata) -- in August -- Big Thompson Ponds, CO   white & cream ​    

wild cucumber (Echinocystis lobata) -- in August -- Arapaho Bend, Fort Collins Natural Area, CO  

wild cucumber (Echinocystis lobata) -- in September -- Arapaho Bend, Fort Collins Natural Area, CO

wild cucumber (Echinocystis lobata) -- in September -- Springer, Fort Collins Natural Area, Larimer County, CO